Is "hole in the ground" a meteor impact crater? Where on your route is it?

Right here, Jeremy. Itching to be able to fly that direction myself, sooner rather than later!

My understanding is that it is a crater from an explosion of steam when this area was a lake some 18K years ago, or something like that. It is not an impact crater. Other interesting sites in this area;
Fort Rock - An outcropping of rock that looks like the walls of a large fort.
Crack in the Ground - Not to be outdone by Hole in the Ground. Crack in the ground is a length of open fisure a couple miles in length and up to 80' or so deep. Very narrow but you can walk and climb around the bottom.
Newberry Crater - The remnants of a very large volcano now standing with two lakes in it.
Ice Caves and Lava Tubes - They are all over this area.

There is much more to be seen in this area of Central Oregon if you get that chance to get to the Bend/Sunriver area.